Customers most agreed on the following attributes:
Comments about Boater's World Boater's World Insulated Non-Skid Tumblers Royal 16oz:
non skid ring and wide bottom make it very hard to turn over!!
Comments about Boater's World Boater's World Insulated Non-Skid Tumblers Royal 16oz:
We have similar double-walled glasses at home that work great but don't have the non-skid bottom and wouldn't work well in the glass holders on the boat, so we bought these. The only thing that I would do differently would to be to get them in a lighter color. The dark blue gets hot sitting in the sun.